Metal-coating apparatus



Filed Dec. 30, 1926 2 Sheets-Sheet l INVENTOR. fiimu A TTORNEY.

' Jan. 13, 1931. B. P. FINKBONE I 'METAL COATING ARPARATUS Filed Dec. 30, 1926 2 Sheets-Sheet 2 INVEN7T0R.

? m mp ATTORNEY.

Patented Jan. 13, 1-931 UNITED STATES. "PATENT OFFICE-:-

IBENJAMIN r. rmx'noma, or MIDDLETOWN, 01110, ASSIGNOR TO THE AMERIC N Rom.- me MILL COMPANY, or MIDDLETOWN, 01110, A CORPORATION" or OHIO MET L-COATIN APPARATUS Application filed December 30, 1926. Serial No. 158,079.

My invention relates to devices used for galvanizing or coating sheet metal with z nc and its alloys, and more particularly to coating with commercially pure zinc when alloyed! with a substance which has'a high tendency to develop dross, requires a higher temperature than normal galvanizing, and in addition has a high'solvent action on the usual iron employed in the casting of galvanizing pots.

"can be employed with advantage in my novel machin a cleaned-sheet of metal is passed through a flux, maintained at high temperature within a speciall heated flux box, which flux will prefera ly be floated on a fairly. thin layer of pure molten zinc. The

flux may contain zinc ammonium chloride and ammonium chloride. In the main body of the pot, a body of moltenlead will be maintained, through which the sheet passes from the flux box, and Without the intervention of any rolls, passes. under a dividing diaphragm in the pot and thence up through the lead where it encounters a floating body of molten -zinc and aluminum, in which the aluminum is high enough in proportion to prevent development of spangle in the final product, say above three per cent, and preferably around eight per cent. Elements 1n the exit end of the pot keep'up an agitation that maintains the zinc aluminum alloy in proper condition, and the -sheetpasses out between exit rolls, having a coating consisting of thezinc aluminum alloy upon its sur-. face.

The objects of my invention are to eli'minate as far as possible the danger of contamination of the coating material and-cut down the loss due to deterioration of the container or'po't; to provide a diaphragm separating the exit end from the entrance end' of the pot to simplify and improve flux boxes in which added heat can be employed to avoid theoverheating of the main leadbath, and hence the coatingma't-erials at the ex1tof the pot, and sti'llimpart'a proper fluxlng temperature, and generally to provide a coating apparatus along the lines of a galvanizing device, but suitable for the application of pure zinc'coatings and coatings of alloys of zinc, and alloys of zinc spelter; the latten beingan alloy of zinc, lead, tin and other metals not refined out in the process of spelter production; also to provide the form of stirring or skimming rolls, placing one on either side of the exit rolls. The object of these rolls being ing dross in as liquid a condition as possible and also to keep'this dross, or other foreign substances, removed from the exit rolls.

This being accomplished by having these stirring orv skimming rolls placed very close to the exit rolls and traveling in'the same direction as rolls nearest them.

I accolnplish'my objects by that certain construction and arrangement of parts to be hereinafter more specifically pointed out and claimed.

In-the drawings Figure 1 is a central vertical section taken through'the device.

Figure 2 is a plan view of the exit end of the device.

Figure 3 is a detail the parts separated V I have not shown the brick work in which of the flux box. with the pot is supported, nor the devicesfor.

heating the outside of the pot, and located within the brick W0; since there is no difference bet-ween my device and regular devices in use in the industry today, in these particulars.-

The pot 1 Will be rectangular in shape and tapered toward the bottom, and. may be formed as an iron casting ry stock. The entrance guides and rolls will not be of standard equipment. The flux box 'is formed of two side plates welded to the two compartment ends.- These ends, as indicated at 4 and 5, will be formed of plates having inturned base flanges 4a and 5a, to which .are welded apartition plates 46 and 56,. thus forming to keep the floatof usual foundfor an eflect-ive agitation element in the pot as do the exit rolls, 4 0 same level, there being a small enough that the sheet will reach to the exit rolls for feeding purposes, upon being fully inserted.

Welded into the pot, preferably centrally 1 thereof, is a metal plate 9 serving as a sep-' arating wall or diaphragm; hich extends down to the guides, it being desirable to have thediaphragm asfully dividing the pot into two parts as the necessities offeed- I .ing the sheet through the bottom of.the.x pot will permit. Welded into the exit side of the pot is an open shell 10, which is formed of nickel,

chromium and iron alloy, in which the chromium will be around ten per cent or above. This shellsurrounds the portion of the pot in which the coating materials are floated on the sustaining bath.

The exit rolls are indicated atoll and 12,

the roll 11 being driven. and having a.-worm 0 gear l3fthereon,

which is driven by a worm 14. .The several rolls and driving elements are held by frames 15, that are secured to the end of the pot and the partition or d1aphragm. .The worm shaft is driven by a' beveled gear drive 16, from a shaft 17 mounted atrossthe top of the pot on suit able bearings 18. i a

The stirring rolls 19 and 20 extend across and are at the beveled gear driven shaft 21 for each stirring roll, which rolls are driven by wormgears 22, as in the instance of the exit roll 11. The drives for the stirring rolls are located on the opposite side of the pot from the exit roll drive,

and the arrangem t is such that they turn I in the same directi n as the exit rolls near which they are located. In Figure 1 I have shown. by arrows the directions in which the 59 exit rolls and the stirring rolls rotate.

"Two weighted arms 23 are mounted onv pivots at 24, and are equipped at their lower ends by shoes 25 which engage the spindles of the exit roll 12. This roll has a gear 26, driven from a gear 27 on the end of the exit roll 11, and lies in bearings 28 'in the frames 15,, which are wide enough topermit of lateral movement'of the roll.- The teeth of the two gears will mesh within the -.range of movement of this roll 12, and thus 'the weighted arms control the pressure of the exit rolls on the sheet that is being fed thereby, and this arrangement avoids .too'

('5 much mueezing when the rolls become fully coated, and too little pressure or slippage when the rolls are cleaned.

The entire machine excepting the exit rolls are preferably formed of nickel, chromium alloy of iron that is' employed for the protective shelL The operatlon of my device will not re quire descrlption-aside from the statement that the sheet passes down through the flux box through the guides to the exit rolls, and

that in the portion of the pot between the...v

diaphragm and the exit end, the-re willbe located a floating body of thecoatiiig material.

The flux box itself will be valuable where it is desired in any instance to control the heat of the flux without substantially altering the heat in the main body of moltenmetal in a galvanizing device. In the particular process for which the device is used,

where some ure zinc is floated at the entrance end, te electrically heated flux box has been found quite useful. It will be noted that to the least degree are materials permitted to get into the flux box from the exit end of the device, and

that rolls and driving parts are eliminated except where absolutely required, and the v exit end of the structure.

Having thus described )my invention,

what I claim as new and desire to secure by Letters Patent, is

' 1. A metal coating apparatus comprising a pot, having at its exit end an internal shell of an alloy of nickel, chromium and. iron in which the chromium is at least '10 per cent to avoid solvent action with the coating material, and a partition between said exit end of the pot and'the remainder of the pot.

'2. A metal coating apparatus comprising a pot, havi at its exit end an internal shell of an a oy of nickel, chromium and iron in which the chromium is at least 10 per cent to avoid solvent action with the coating material, anda partition between said exit end of the pot and the remainder of the pot, and extending to a point adjacent the base of the pot sufiicient to permit a sheet to pass beneath it and above the' bottom of the pot.

1 3. A metal coating apparatus comprising a pot, having a partition dividing it into two parts, except for a space to permitthe Passage stirring or skimming rolls in the one part, and flux box in the other art, an internal shellof an allo of nicke chromium and iron in which t e chromium is at least'10 percent about said rolls within, the pot to avoid solvent action of coating material,

of a sheet beneath it, exit rolls and and a flux box at the other-{end of the pot, having means for heating'it additionally to the heat from the metalin, the pot.

4. A metal coating apparatus 'comprising a pot, having a partition dividing it into two parts, except for a space topermit the passage of a sheet beneath it,ex it rolls and stirring or skimming rolls in the one part, and flux box in the other part, an internal shell of an alloy of. nickel, chromium and iron in which the chromium is at least per cent about said rolls within the pot to avoid solvent act-ion of coating material, 10 and a flux box at the other end of thejpot, having means for heating it additionally to the heat from the metal in the pot, said exit rolls being the only mode of feeding a sheet of metal that is-located within the pot.

, 5.ln a metal coating apparatus a pot,

and a flux box for $9.1 pot, said dux box having integral hollow walls,"and means for applying heat. within said hollow walls. 6. In a metal "coa apparatus, a pot, and a flux box for sai pot, said flux box havingintegral hollow walls, and means for applying heat within said hollow walls, said heating means comprising 'electrical heating elements. a 7. In a metal coating apparatus,.a pot, and a flux box within thepot, said box formed of metal plates forming four. walls thereof, one of said metal plates, at least,- having an .inturned base fla e, and-a partition plate secured .to' said i 1;: and the two sidewalls adjacent thereof, forming a {:gllow member as part of the 'wall of the X. 8. In a metal coating apparatus,-a 0t, and a flux boxwithin the pot, said liox formed of metal plates forming-four walls. thereof, oneof said metal plates, at least, having an 'inturned base flan and a par-' tition plate secured to said e and the 40 twoside walls adjacent thereof, forming a hollow member as part of the wall of the box, and an electrical heating element with in saidhollowmember.. v

BENJAMIDIF- P. FINKBONE. 

